获取完整的URL request.getQueryString()

public  String codeToString(String str) {

        String strString = str;

        try {

            byte tempB[] = strString.getBytes("ISO-8859-1");

            strString = new String(tempB);

            return strString;

        } catch (Exception e) {

            return strString;

        }

    }

    /** *//**

     * 获取完整的Url

     * @param request

     * @return

     * @throws Exception

     */

    public String getBackUrl(javax.servlet.http.HttpServletRequest request) throws Exception {

        String strBackUrl = "";

        try {

        strBackUrl = "http://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() 
　　　　　　　　　　　　+ request.getServletPath() + "?" + this.codeToString(request.getQueryString());

        strBackUrl = java.net.URLEncoder.encode(strBackUrl,"gbk");

        } catch(Exception e) {

            throw e;

        }

        return strBackUrl;

    }